Compressor



May 4 1926. 1,583,231

- F. D. HOLDSWORTH COMPRESSOR Filed Feb. 15, 1924 C) mm Patented May 4',1926:.

UNITED STATES PATENT OFFICE.

FRED ID. HOLDSWORTH, OF CLAREMONT, NEW HAMPSHIRE,' ASSIGNOR TO SULLIVANMACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

COMPRESSOR.

Application filed February 15, 1924. Serial No. 693,120.

To a?! whom, it may concern.-

Be it known that I, FRED D. Honnswonrrr, a citizen of the United States,residing at Claremont, in the county of Sullivan and State of NewHampshire, have invented certain new and useful Improvements inCompressors, of which the following is a full, clear, and exactspecification.

My invention relates to compressors, and particularly to rotarycompressors.

An object of my invention is to provide an improved compressor. Anotherobject of my invention is to provide an improved rotary compressor. Afurther object of my invention is to provide an improved rotarycompressor which while it is adapted to compress air to a considerablepressure will yet operate eliiciently when compressing to.

lower pressures. A still further object of my invention is to provide animproved compressor of the rotary type which, although designed tocompress to a substantial pressure, will not be wasteful of powerduringthe building up of its designed pressure in the receiver or dischargeline. Other objects and advantages of my invention will hereinafter morefully "appear.

In the accompanying drawings I have shown for purposes of illustrationone form which my invention may assume in practice.

In these drawings,

Fig. 1 is a plan view with parts broken away of an illustrativeembodiment of my invention.

Fig. 2. is a transverse vertical section on a plane corresponding toline 22 of Fig. 1.

Fig. 3 is a detail fragmentary sectional view on a plane correspondingto line 33 of Fig. 1.

In the illustrative embodiment of my invention I have shown the samecomprising a casing consisting herein'of three main parts, a centralrotor housing 1 and heads'2 and 3. lVithin the rotor housing there areformed a pair of intersecting bores 4 and 5 which form rotor chambersand-the rib between these is cut away below to form a bottom 6 throughwhich opens a passage 7 which may be supplied with air through either orboth the pipes 8 and 9. \Vitlnn the rotor chambers there are a pair ofrotors 11 and,12, which rotors may be formed if desired as in the patentto Leonard, 1,188,286, or each in the form of a air of such spiralelements with an intermediate spur gear element, these rotors beingthereby provided with intermeshing tooth blades forming pockets withinwhich the fluid may be compressed and these rotors are keyed or other-.wise held on shafts 13 and 14. The shaft 13 isjournuled in a suitablemanner in the opposite heads, the mode of journaling not being shown asit is not material to my invention; while the shaft 14 is provided withan'extension l5 and is suitably journaled at its opposite ends by meansnot shown, the extension carrying a gear 16 which is driven by aninternal gear 17 on a shaft 18, while the shaft 18 carries a drivingpulley for the compressor. The speed multlplying gearing increases theoutput of the compressor.

Above the rotor chambers and formed in the upper part of the casing 1 isa chamber 20 and connecting this chamber with the rotor chambers is aseries of ports. One of these ports 2l'is arranged midway between therotors and also midway of the length thereof and this is the finaldischarge passage for fluid. At opposite sides of the passage 21 thereare arranged passages respectively designated 22, 23, 24 and 25, thesepassages not being spaced a great distance from the passage 21.Additional passages communicate with the ports 22, 23, 24 and 25, andthat the pockets will come into communication with this last mentionedseries of ports earlier than they will communicate with the centraldischarge port 21. The several passages 21 to 29 open through a valveseat surface, this surface herein being desig- .nated 30 andbein in theshape of an X at the intersection 0 whose armsthe passage 21 is disposedand in whose arms the other passages also terminate. At the ends of thearms there are provided guiding shoulders 31, 32, 33 and 34 and theseserve to maintain in position an annular valve 35. Mounted in ea h oneof thearms of the X adjacent" the central opening 21 is a pin, theseseveral pins wing; ia'h'licaie i hetrcin by the same ruu- Emmi, namely3?"; lheee pins at their cuter side's guide second valve member 38 Whilewith the inner edges they guide a third, E rcund valve membei It will benotc that the valve member ccnti'cis the ports 2fi, 2'?', 28 and heannulmr *v aive contrcls the 22, 2 .2 and 25., and the ()i'fClflfiI vaive 3 combo-is the passage 21, it will be cbs ecved that a guard plate40 is hfi xd by machine screws ii in spaced reiaticn "no the valve andserves it; prevent the if- 2m f the 7- 1:0 an excessive height ebcveiheir seat: Suitable ccclingijacket rnezms is pz'evldcd for thecompressor.

The cpemticn of this device W121 be 1e:'),c .3 appdrent. iii beumferstocd Feat 1f rcceivw or dis-cl'xarge line 430 when the 1 Y fled m;m p air ini W11 mud an ill; aimcsphe 'ic the it-001: peckcie, were theyto the we trapped in them uniiii 2 hair ccn'amw-lc 'ticn wliin ehe pas-(lie 2?. $11 :mi'izfi; amcuni 0f 1 01416. cemprcss the reand this WO'ikiz ilerc vcz' er ziischarge line. map of the ccmpres= :mwun' cf ccmprese210mb psckcts Wiii be '7 onwi'h fine ports 11% pressure within 11greater than that r'jher ccmmeseuc sivc dise e22, e gwcssure iii thereas; up ice higher evideni; ilnat the math pccke qs will pressure when$0 .ce under eufiicieni;

- e 536 "1", 28 and 29 are reached tc 1mseat file waive 35, but m case'ahe' pressure ill ike valve ches'a iis substzm'bi al beiow ihc dei 3may be that var-fie 38 be chambers 01' ccmmum mien with the cud 25, thePYQSSUEO, siili 'higher amount, however,

will finally be discharged 0711p cm'fi 2L twill accordingly be Ki haveprcvideci en am'angemcn'e 'Whiifih wiii permit thcreughiy cfiicieni;operw ticn in izhc the avoidance of over ccmpreseiem but whim: W11ncnethciess pew mic the ccn'l preszser fie cpera'cc effectively when theciischarge pressure is the maximum desireci and which. *wni, mmec'ver,permit efiicient cpemtion with constant discharge Kine pressure belowthe maximum.

While-X have in this applica' z-ion specifice'il z described cne fonmwhich m invenmeasure will Eve Mac Wiifi cease :0 open the ticn mayassume in pmeuice, it "Willi be 1211- Yenticn may be moiified andembodied in "n'arions other forms Without departing frem its spirit orthe scope of the appended claims. v

What claim as new and esire to secure by Letters Patent is:

1. En. a rotary col'npresso'c, means forming; Cfising' having intercommunicating rotor chambers rotors in said chambers having spirallydisposed intermeshing tooth biafies forming with the Willis cf saidchambers compressive. pockets, mews for (Eischerging" ccmpressed fluid;imcluding ports ccnmnmicafing with said chambers at dif- :fercntdistances from tiac'mesn line of said 2. in & mtery compressor, meansleveling :a casing having inierccmmuniceiim? rector 'uamlacrs, rotors insaid chmnbersfi 51-11113 disposed intermeshing tooth; blades fawningwith the walls cf said; chambers compression packets; means fer dis--chm'giz xg compressed fluid including pea-ts conmmnimting wihh saidchambers at different disfances {mm the median transverse plane 05 saidraters.

a roiary ccmpr sscr, means forming a casinghaving intezcemmunica'tingrotor chambers, raters in said chambexqs having spirally disposedintermeshing tcchh blades fcrmmp; wli'ih the Wells of sand chambersforming caving communicacing with. said chambers at dif fcreni:distsmces frcm the meek raters.

in a roomy-y ccmpresscr, means farming & casing havingintercommuniceting rotor chambers, rctors in said chambers having;

line of said spirally disposed intermcshing teeth blades forming withthe eiis 015 said chambers ecmpresslcn pocketmanc'i vaivcd means for'disclm ing; compiessed fluid including ports communicating with saidchambem at diffcb ent disfanccs from the medmn igransverse piane of?said rotors.

6 In. a, rainy compressor, meens forming a casing; havingintercoimmm'icaiiing i-ctcr chumbem raters in saidchambers havingspirally disposed intermcshing tooth blades fcnning With'thc walls cfsaid. chambers Ill - charging compressed fluid including portscompression pockets, and valved means for discharging compressed fluidincluding ports communicating with said chamber at different distancesboth from said mesh line and from the median, transverse plane of saidrotors.

7. In a compressor, means forming a housing providing intercommunicatingrotor chambers, rotors therein having intermeshing spirally disposedtooth blades, means for rotating said rotors'so that said tooth bladesform pockets of diminishing area as rotation takes place, port meanscommunicating with said chambers such that said pockets will communicatetherewith at different periods, and separate valve means for the portmeans communicated with by said pockets at different times.

8. In a rotary compressor, means forming a casing havingintercommunicating rotor chambers, rotors in said chambers havingspirally disposed intcrmeshing tooth blades forming with the walls ofsaid chambers compression pockets, and means for discharging compressedfluid including ports communicating with said chambers at differentdistances from the mesh line of said rotors, and common valves for suchof said ports as are disposed at equal distances from said mesh line. I

9. In a rotary compressor, means forming a casing havingintercommunicating rotor chambers, rotors in said chambers havingspirally disposed intermcshing tooth blades forming with the walls ofsaid chambers compression pockets, and means for dis communicating withsaid chambers at diiierent distances from the mesh line of said rotors,and common automatically actuated valves for such of said ports as aredisposed at equal distances from said mesh line.

10. In a rotary compressor, means forming a casing havingintercommunicating rotor chambers, rotors in said chambers havingspirally disposed intermeshin tooth blades forming with the walls ofsaid chambers compression pockets and means for dis charging compressedfluid including .ports communicating with said chambers at differentdistances'from' the median transverse plane of said rotors, and commonvalves for controlling p orts at equal distances from said mediantransverse plane.

11. In a rotary compressor, means forming a casing havingintercommunicating rotor chambers, rotors in and chambers havingspirally disposed intermeshing tooth blades forming with the walls ofsaid chambers compression pockets and means for discharging compressedfluid including ports communicating with said chambers at differ entdistances from the median transverse plane of said rotors, and commonannular valves for controlling the discharge of fluid through the portstances from the median transverse plane of the rotors.

12. In a rotary compressor, means form-- mg a casing havinginter-communicating rotor chambers, rotors in said chambers havingspirally' disposed intermeshing tooth blades forming with the walls ofsaid chan'lbers compression pockets, and means for dischargingcompressed fluid including ports communicating with said chambers atdifferent distances both from the mesh line of the rotors and from themedian transverse plane of said rotors, and annular valves each of whichcontrols all the ports at given distance from the intersection of thevertical plane including the mesh line of the rotors and the mediantransverse plane of the rotors;

13. In combination, in a compressor, a casing having intercommunicatingrotor chambers, rotors therein having intermeshing spiral tooth bladesforming longitudinally contracting compression pockets, and dischargemeans communicable with said compression pockets when the extremities ofsaid pockets are at different angular positions.

14.111 combination, in a compressor, a casing having intercommunicatingrotor chambers, rotors therein having intermeshing spiral tooth bladesforming longitudinally contracting compression pockets, and dischargemeans operative to permit dis charge of fluid from said pockets wheneverthe pressure therein exceeds the pressure in the discharge line by acertain small amount.

15. In a rotary compressor, a'casing, intermeshing spiral-toothed rotorstherein 00-- operating to form longitudinally contracting compressionpockets, and means operative to permit discharge of fluid at differentpressures from said pockets.

16. In combination, a compressor casing having intercommunicating rotorchambers,

cooperating rotors therein rotatable on axes always relatively fixed,and discharge means communicable with said rotors at different angularlyrelated positions.

17. In combination, a casing having intercommunicating rotor chambersand cooperating compressor rotors disposed therein,

inlet and discharge passages communicating therewith, and valvular meanscooperating. with said rotors independently of said inlet passage tocontrol the pressure of the fluid compressed by said rotors.

18. In combination, a casing having intereommunicating rotor chambers,cooperating compressor rotors disposed therein, and valve controlledmeans cooperating with the periphery thereof to control the pressure towhich fluid is compressed by said rotors.

, 19. In combination, a casing having intereommunicating rotor chambers,cooperating compressor rotors disposed therein, and valve controlledmeans cooperating with the periphery thereof to control the pressure towhich fluid is compressed by said rotors, said valvular means Comprisinga )lurality of valves made successively inoperative as the pressure orthe fluid compressed by said rotors increases.

20. In combination, a casing having cooperating compressor rotors and anoutlet passage, discharge with said outlet passage and the rotorperipheries, and. valves for controlling said discharge passage adaptedto be successively inoperative in accordance with the degree of pressurein said outlet passage.

21. in combination, fluid compressing mechanism, an outlet passage,discharge passages communicating with said compressing mechanism andoutlet passage, and a pinrality of valves made successively operative toclose certain of said. discharge passages automatically in accordancewith the pres sure in the outlet passage.

22. in combination fluid comnressins mechanism, an outlet passage.discharge passages communicating with said coniipressing passagescommunicating mechanism and. outlet passage, a plurality of valves madesnlircessively operative to close certain of said discharge passagesautomatically in accordance with the pressure in the outlet passage, andmeans whereby fluid flow through. one of said discharge passages may behad during the closure or" the other passages.

23. in combination with a compressor having an outlet passage, of aplurality of discharge passages allowing connnunicaiion betweensaidcompressor and outlet passage. and means for closing: cerrain oi? saiddischar e passages in accordance Wish the pressure in said outletpassage While allowing fluid iiow throw h the remainder of saidpassages.

in combination, a compressor casing enclosing cooperating compressorrotors, and means cooperating x ith the periphery of said rotors-andalways having a longitudirw 1 E1. 'ii' nail nned. IOlilUOil thereto 10LCOlllr-Qdlllg the degree of pressure to Wlllflll fluid 18 con1- pressedby said rotors.

in testimony whereof l. sill my signa- Lure.

